摘要
为实现半焦在煤粉工业锅炉中的高效燃烧利用,根据半焦燃烧特性分析和CFD(计算流体动力学)数值模拟结果,提出针对高效煤粉工业锅炉常规双锥燃烧室的燃用半焦技术改造措施,分别采用常规和半焦燃烧室进行半焦粉燃烧试验。结果表明:半焦相比神府煤着火温度高、燃烬温度高,燃烧特性指数值均偏低;与常规燃烧室相比,半焦在半焦燃烧室燃烧时,着火更迅速,预热时间和伴燃时间均缩短1 min。起始着火位置前移,空气过量系数范围拓宽,炉膛轴向最高温度下降、温度分布更均匀,残炭率由57.54%降低为6.89%,实现了半焦在高效煤粉工业锅炉中的高效稳定燃烧。
In order to improve char combustion efficiently in industrial pulverized coal fired boiler,technology improvements of double-cone chamber,which was widely used in pulverized coal fired industrial boilers,were conducted according to the results of combustion characteristics and numerical simulation. Char combustion experiments in both kinds of chambers were conducted. The results showed that,compared with common chamber,the char burned more rapidly in chamber designed for char. The firing position moved forward,the temperature axial distribution through the furnace was more uniform. The range of excess air coefficient was extended. After transformation,the burn-out rate of char is significantly increased from 57. 54% to 6. 89%. The stability and efficiency of char combustion was obviously improved.
出处
《洁净煤技术》
CAS
2016年第3期93-97,共5页
Clean Coal Technology
基金
中国煤炭科工集团科技创新基金资助项目(2013QN035)
关键词
双锥燃烧室
半焦
着火热
燃烬率
combustion chamber
char
ignition heat
burn-out rate